<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <!--
            .lazy修饰符:
            把v-model的本质中@input事件改变为@change事件
            当input失去焦点的时候才会触发更新数据

          .trim修饰符 
            取掉收集的数据的前后空白字符
          -->
        <input type="text" v-model.lazy.trim="msg">
        {{msg}}
        <hr>
        <input type="text" v-model.number="number">
        {{number}}
    </div>
    <script>
        Vue.config.productionTip = false;
        let a = '   hjhk       ';
        console.log(a.length)
        console.log(a.trimStart().length)
        console.log(a.trimEnd().length)
        console.log(a.trim())
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    msg:'',
                    number: 0
                }
            }
        })
</script>
</body>

</html>